Am I missing a setting, or is this not available with the Apple TV app? I have the Samsung Smart TV app, and it appears there with no issue.
Fanart has not been added to the Apple TV yet. Hopefully it is soon or at least a blurred background versus the blank colour we see now which is boring. As it stands the AppleTV leaves much to be desired. I have spent a lot of time adding my backrounds and because of this I don’t use the AppleTV for plex until this missing feature is added.